[Amps] Grounded B+ amplifier
r at somis.org
Fri Feb 27 09:37:11 EST 2004
>On Thursday 26 February 2004 17:33, Bill Turner wrote:
>> Years ago I recall reading about an amplifier where the B+ supply was
>> grounded and the cathode was "hot" with the B- supply. I'm wondering if
>> that might have some advantages for high power amplifiers.
>> Specifically, the pi-network output could be simplified by eliminating
>> the plate choke. Here's how the output would look:
>> Believe it or not, this is a pi-network output circuit, just redrawn.
>> The same component values would be used as with a conventional circuit.
>Doesn't it do a lovely job of offering an alternative insight into how a pi
>network matches between the antenna and plate. The load control is the lower
>capacitor and provides a variable 'tap' up and down the tuned circuit.
** Indeed, Steve, indeed. It also might help folks understand why such
a circuit resonates c. 10% lower than the operating frequency.
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